Duke has priorities, especially when it comes to eating. He knows that a bowl full of yummy dog food is very good for him but he also knows that dads dish is full of things that are much tastier.
That is why he always sits patiently waiting and watching to see what dad might have to offer.
Even though his bowl is sitting right there with food in it. He also knows who is more likely to slip him something good and that's who he watches the most. Either way though, Duke will not touch his food until all plates have been cleared from the table, just in case.